Valve means for liquid fuel pumps



May 9, 1950 E. A. WAT$ON ET AL VALVE MEANS FOR LIQUID FUEL PUMPS Filed April 6, 1945 Patented May 9, 1950 UNITED STAT ES PATENT oFFicE 3 VALVE MEANS PUMPS Ernest Ansley Watson and: Richard J oseph-Iiield, Birmingham, England, assignorsto J oseph Lucas' Limited, Birmingham, England Applicatibnfipril 6, 1945, .SerialNo1;586,966'

In Greati'Britain February23,.1944i Section 1, Public Lawsemnngusts; 1914c Patent expires February23; 1864* SOlaiins. (Cl. 137-153) This invention relates to valve means for liquid fuel pumps of the type having combined therewith means for automatically controlling the output in response to differing conditions.

In the accompanying sheet of explanatory drawings- Figure 1 is a sectional side view of means constructed in accordance with the invention, and Figure 2 is a sectional view of a modified detail.

One form of pump to which the invention is applicable comprises a rotary cylinder block provided with a plurality of spring loaded plungers, the latter co-operatin with a swash plate which is angularly adjustable for varying the pump output. The automatic adjustment of the swash plate is effected by a spring loaded piston contained in a cylinder embodied in the pump housing and connected by a rod to the swash plate. The two ends of the cylinder are interconnected by a restricted passage and liquid is supplied to one end of the cylinder from the delivery side of the pump. In association with the end of the cylinder remote from the end to which the pressure fluid is supplied is arranged a vent.

An example of a pump as above described forms the subject matter of Patent No. 2,403,371 (Serial No. 467,408).

In carrying the invention into effect as shown in Figure l, in which the above mentioned vent is indicated by 2 W, a valve 20 for controlling the vent 2| is carried by one end of a lever 22, the latter being secured at a position intermediate its ends to a diaphragm M which serves as a fulcrum for the lever, and forms a dividing partition between two chambers 42 43 In the chamber 42 is arranged a flexible capsule 26 which is supported at its opposite ends respectively by the end of the lever 22 remote from the valve M and by an adjustable abutment M. The chamber 42 communicates in any convenient manner with the outer atmosphere, and the capsule 26 is responsive to atmospheric pressure. The valve 20 is situated in the other chamber 43, and is loaded by a spring e acting on the adjacent end of the valve lever 22 The chamber 43 also contains one end of a, plunger 33 which is responsive to the fluid pressure at the delivery side of the pump, and which is arranged to act on the valve lever 22 at a position between the valve 120 and the diaphragm 4P. The plunger 33 is slidably supported by a flanged cylindrical guide 44 extending through one side of the chamber 43 the guideibeing angularly adjustable, and the plunger bein g' 'situated eccentrically in relation to the guide'fso that the position' at which theplunger acts on the lever 22 can be varied by angular adjustment of the guide. At the end remote from the valve lever 12 the plunger 33 is supported by an abutment on one side of another diaphragm 46 through which the fluid pressure at the delivery side of the pump can act on the plunger, this latter diaphragm being secured between the outer end of the guide 44 and a pipe connection 41 adapted to communicate with the said side of the pump.

Instead of the diaphragm 46 we may employ a cup-washer 46 as shown in Figure 7, this washer bein slidable in the adjacent end of the pipe connection 41 and being attached to the abutment 45 which serves to support the adjacent end of the plunger 33 By this invention we are able to effect the control of the pump output by the actions of atmospheric and pump-delivery pressure in a very convenient manner. But th invention is not limited to the examples above described as subordinate constructional details may be modified to suit different requirements. Also the invention may be applied in substantially the same manner to the fluid operated governing mechanisms of pumps other than the example specified. Further we desire it to be understood that by atmospheric pressure we mean the pressure of any conveniently available air which may be the outer atmosphere, or the atmosphere in any room or compartment associated with the system to which the invention is applied, but not incluuding compressed air supplied by a blower or the like to any part of the system.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. Pressure-fluid valving means comprising in combination a liquid vent, a valve controlling the vent, a lever carrying the valve, a pair of chambers containing opposite end portions of the lever, a diaphragm separating the chambers and attached to an intermediate part of the lever, a plunger responsive to liquid pressure and adapted to act on the lever, and a flexible capsule responsive to atmospheric pressure and adapted to act on the lever.

2. Pressure-fluid valving means comprising in combination a liquid vent, a valve controlling the vent, a lever carrying the valve, a pair of chambers containing opposite end portions of the lever, a diaphragm separating the chambers and attached to an intermediate part of the lever, a; spring arranged in one of the chambers andacting on the lever, a plunger responsive to liquid pressure and adapted to act on the lever, and a flexible capsule responsive to atmospheric pressure and adapted to act on the lever.

3. Pressure-fluid valving means comprising in combination aliquid vent, a valve controlling the vent, a lever carrying the valve, a pair of chambers containing opposite end portions of the lever,

a diaphragm separating the chambers and attached to an intermediate part of the lever, a spring arranged in one of the chambers and acting on the lever, a plunger responsive to liquid pressure and adapted to act on the lever, and a flexible capsule responsive to atmospheric pressure and adapted to act on the lever, the valve being carried by the portion of the lever in the chamber containing the spring, the plunger being arranged to act on the lever at a position between the valve and diaphragm, and the capsule being arranged in the other chamber.

ERNEST ANSLEY WATSON.

RICHARD JOSEPH IFIELD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 21,758' Foisy Apr. 1, 1941 1,585,732 Otto May 25, 1926 1,983,225 Gregg Dec. 4, 1934 2,177,098 Doe et a1. Oct. 24, 1939 2,208,122 Dickson July 16, 1940 2,273,670 Udale Feb. 17, 1942 2,283,175 Berger May 19, 1942 2,292,125 Ifield Aug. 4, 1942 2,313,149 Jacobson Mar. 9, 1943 FOREIGN PATENTS Number Country Date 475,699 Great Britain Nov. 29, 937 

